get_thumbnail

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden. It adds useful behavioral context: returns base64-encoded JPEG and explains the composite ID format for host. But it does not disclose potential errors, rate limits, authentication needs, or the fact that this is a read-only operation beyond the verb 'get'. Some transparency is present but not rich.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact and front-loaded: the main purpose and return format appear first. Parameter explanations follow in a clean format. Every sentence earns its place; no fluff or redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

An output schema is present, so return values are presumably documented. The description covers both required parameters and clarifies the host's composite format. For a simple retrieval tool, this is sufficient; minor gaps like error handling are not critical given the output schema.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must compensate. It does: host is explained as 'console name, ID, or composite ID (MAC:numericId format)' and thumbnail_id is tied to detection records. This gives agents meaningful guidance beyond raw string type declarations.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'Get a detection thumbnail crop' — a specific verb and resource. It distinguishes itself from generic getters like get_camera_snapshot or get_recognition_group_image by mentioning 'detection' explicitly. However, it does not name or differentiate from those sibling tools, so it falls short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage: thumbnail_id is described as 'from a detection record', suggesting it should be used when the agent already has a detection record. But it gives no explicit guidance on when to use this tool versus alternatives like get_recognition_group_image or get_camera_snapshot. No exclusions or when-not-to-use are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.